That dual mode mini map, showing the lines/change of height, sounds really good. I would love to see a version for the main map. Say press a button and see the other way the map, to see clearer the change of elevation. Next to changing graphics engine and going 3D, that would be a very nice.

Already supported, if you have the full game of course!. I am currently playing at that resolution as it is the native one for my monitor.

The resolution you want is called "desktop".

The fixed resolutions the game offer are legacy 4:3 square aspect ratio resolutions dating back to MSDOS and CRT monitors, or maybe for someone who still has a dinosaur CRT monitor hooked up to their PC. (CRTs still have some uses such as graphics work apparently)

Desktop resolution plays at your current screen resolution, others have played the game with higher resolution monitors.

Desktop is listed at the bottom of the list of resolutions after the legacy 4:3 ones.